Keyboard crossfade curve for the region.
Values can be:
- gain: Linear gain crossfade. This setting is best when crossfading phase-aligned material. Linear gain crossfades keep constant amplitude during the crossfade, preventing clipping.
- power: Equal-power RMS crossfade. This setting works better to mix very different material, as a constant power level is kept during the crossfade.
|xf_keycurve||SFZ v1||string||power||gain, power|